The porcupine is a large rodent known for its unique coat of sharp quills. These quills are modified hairs that serve as a defense mechanism against predators. When threatened, a porcupine can raise its quills to appear larger and more intimidating. If a predator gets too close, the porcupine can also release its quills, which can become embedded in the attacker. Porcupines are primarily nocturnal and are found in various habitats, including forests and grasslands. They are herbivores, feeding on leaves, bark, and fruits. There are two main types of porcupines: North American porcupines and Old World porcupines, each adapted to their respective environments.